Well I have a Z Ultra GPE completely all stock no mods done and the OTA has not reached me as of yet so I was curious if there was a way to push the downloaded copy I have received from here that i have downoaded onto the device its self

Be warned it may break your camera (mine and a few other users quit working after update) but it can be done. Follow DooMLoRD's guide to return to stock but at the end choose install update from SD card rather than adb side load. You should be able to force it into stock recovery by just connecting to PC and holding volume button ( without needing adb installed) update should be on external SD first.

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